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Analog-to-Digital Converter Peripheral Labs
5.2.3.4
TESTING THE APPLICATION
Program the PIC16F690. Turning the potentiometer connected to pin 13 should light
the LEDs sequentially in a binary fashion. Note that these are the 4 Most Significant
bits of the ADC result. Adding 6 more LEDs and I/O pins would allow the complete
10-bit value to be displayed. To determine the significance of each bit in the
ADRESH:ADRESL 10-bit result, see Figure 5-4.
FIGURE 5-4:
ADC RESULT BIT SIGNIFICANCE
10-BIT ADC RESULT (ADRESH: ADRESL)
V DD 1 V DD 1 V DD 1 V DD
V DD 1 V DD 1 V DD
1
2
4 8 16
1
32
64 128
1
256
V DD
1
512
V DD
1
1024
V DD
Note:
Assumes that V DD is used as the ADC reference. If an external
reference is used, the voltage present on V REF pin is substituted
for V DD .
Example:
If following an ADC, the ADRESH:ADRESL contains the following 10-bit
value:
10-BIT ADC RESULT (ADRESH: ADRESL)
1
1
0
0
1
0
0
0
0
1
1
2
V DD +
1
4
V DD +
1
32
V DD +
1
1024
V DD
Bit positions set to ‘ 1 ’
are added together
=
1
2
5V
+
1
4
5V
+
1
32
5V
+
1
1024
5V
=
2.5V
+
1.25V
+
0.15625V
+
0.000488V
=
3.911V
(rounded to the nearest mV)
Note:
? 2009 Microchip Technology Inc.
Using a 5V reference voltage with a 10-bit provides a resolution of
0.000488V or 4.88mV (5V/1024).
DS41369A-page 83
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